Bulent Aliev wrote:

On my 22003 mounts I made Delrin inserts with 5/16 bolt

hole and pressed them in. This

way I can use smaller and much lighter AN bolts.
Bulent

I think you are a bit on the small side there Bulent.
Try 3/8 or 7/16.

Paul Lamar

Bulent Aliev wrote:

Per plans mount needs only 1/4" AN bolts at the firewall.

Yikes! I would not want my engine to fall off. If it throws
a blade I think you might want larger bolts. Kind of hard to

glide

with the missing weight of the engine.

Paul Lamar

Bulent Aliev wrote:

I had a conversation this morning about that with the owner of

Fighter Enterprises in Ft

Lauderdale. He maintains and repairs Mustang P-51's  mostly. He

thinks even 5/16 is over kill.

Also in the Cozy the thrust forces are against the Barry mount,

and not against the bolt, like

the tractor config. Also I looked at a Mooney mount. Again 1/4"

bolts  on the firewall and the

thrust works against the threads on the same bolts?

Wow. My Cessna uses 3/8 or 7/16 I don't remember exactly which....
maybe 1/2 inch.

Push or pull matters not in a six G pull up or a hard landing.

Are you using the "rubber bushing in the firewall trick" Bulent? If
not
then are we talking about the bolts holding the steel mount to the
firewall
or the bolts going through the rubber bushings mounts out near the
engine?
If out near the engine the bolts are in a bit of bending mode while
the
ones holding the steel mount to the firewall are mainly in shear and
tension. That makes a difference. I personally would not use 1/4 or
5/16 bolts
anywhere in the engine mount. Not worth the risk for such a small
increase
in weight.

Paul Lamar

DC 4 used 5 5/16 bolts to hold engine mount to firewall.

.30 Wankle is $449.00 retail, 299.00 mail order, Virg

 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org